Forklift chassis dynamometer system adopts AC electric dynamometer to implement loading road resistance and the principle of spring superposition for load application. Loads full electric inertia on the basis of its own inherent mechanical inertia to simulate road resistance, and can reproduce the road resistance of the vehicle under test or customize road resistance. The system is in accordance with the technical requirements of national standards and European and American certification regulations, referring to international advanced Chassis dynamometer and test line dynamometer for R&D, completely independently designed and developed a brand-new offline test system with independent intellectual property rights. The system reserves an external speed interface, which can be seamlessly connected with external test equipment.